Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/plusDomains_v1.media.html b/docs/dyn/plusDomains_v1.media.html
index 36fdbbb..0616027 100644
--- a/docs/dyn/plusDomains_v1.media.html
+++ b/docs/dyn/plusDomains_v1.media.html
@@ -75,11 +75,11 @@
 <h1><a href="plusDomains_v1.html">Google+ Domains API</a> . <a href="plusDomains_v1.media.html">media</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#insert">insert(userId, collection, body=None, media_body=None)</a></code></p>
+  <code><a href="#insert">insert(userId, collection, body=None, media_body=None, media_mime_type=None)</a></code></p>
 <p class="firstline">Add a new media item to an album. The current upload size limitations are 36MB for a photo and 1GB for a video. Uploads do not count against quota if photos are less than 2048 pixels on their longest side or videos are less than 15 minutes in length.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="insert">insert(userId, collection, body=None, media_body=None)</code>
+    <code class="details" id="insert">insert(userId, collection, body=None, media_body=None, media_mime_type=None)</code>
   <pre>Add a new media item to an album. The current upload size limitations are 36MB for a photo and 1GB for a video. Uploads do not count against quota if photos are less than 2048 pixels on their longest side or videos are less than 15 minutes in length.
 
 Args:
@@ -133,6 +133,7 @@
   }
 
   media_body: string, The filename of the media request body, or an instance of a MediaUpload object.
+  media_mime_type: string, The MIME type of the media request body, or an instance of a MediaUpload object.
 
 Returns:
   An object of the form: